Polyethylene film is generally made by blow molding and casting processes. The thickness of cast polyethylene film is uniform, but due to its high price, it is rarely used. Blow molded polyethylene film is made of blow molding grade PE particles blown by a blow molding machine. The cost is low, so it is the most widely used. Polyethylene film is a translucent, shiny, soft film, with excellent chemical stability, heat sealability, water resistance and moisture resistance, freezing resistance, and boiling.
(LDPE) Its main disadvantage is its poor barrier to oxygen. It is often used in the inner film of composite flexible packaging materials. It is also the most widely used and most used plastic packaging film, accounting for about 40% of the consumption of plastic packaging film %the above.
Since the polyethylene molecule does not contain polar groups, has high crystallinity and low surface free energy, the film has poor printing performance and poor adhesion to inks and adhesives, so it is necessary before printing and lamination Perform surface treatment.
